Larian Studios Forums Divinity - Original Sin Divinity Original Sin - Help/Tips/Tricks White Witch

Still confused. I think this game keeps me in a perpetual state of confusion. I found the White Witch encased in an ice prison and upon reading other posts it seems that I need to have defeated Boreas in order to get a fire element to free the lady. Well I'm In the prison but can't figure out how or where to find this Boreas guy. I tried the front door to the castle and can't figure a way to get past that barrier so could anyone tell me what I have to do to get to this guy?

I would appreciate any help I can get. This game is so complicated there needs to be a decent walkthrough/guide for idiots like me.
EDIT: I found a way to teleport over the wall and killed Boreas and have set the witch free. So now I think I'll try to clear out as many side quests as I can.